Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dd9a5f13ef5804…

MALICIOUS

PDF

76.8 KB Created: 2021-04-05 06:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 380711ee6bd1c78f7f967a25ad6be2de SHA-1: c25e953156b7910a985366b11ff2f61e0f621850 SHA-256: 16dd9a5f13ef58044899a1a1000363e8ee235c271c2cf62752cc1e35818cf89e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, indicating a potential link farm or phishing lure. The primary URL observed is https://botokaw.ru/strik, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=brady+bmp21+plus+repair
    • http://kiwedoro.66ghz.com/agelong_tree_free.pdf
    • https://cdn.sqhk.co/lilomovetum/hfjbcic/sling_blue_price_increase.pdf
    • https://cdn.sqhk.co/fofateze/jgNNLzd/table_top_balloon_arch.pdf
    • https://cdn.sqhk.co/guzowozuk/M4jhTJo/archery_set_for_kids.pdf
    • https://cdn.sqhk.co/vupapevixu/ja23gfm/hilton_checkers_restaurant_menu.pdf
    • https://cdn.sqhk.co/godezixibufo/hbiagjB/listen_to_chris_young_songs.pdf
    • https://nodefosodetapa.weebly.com/uploads/1/3/5/9/135978328/vapox.pdf
    • http://fanelafimud.22web.org/monuwekefuzibidagepa.pdf
    • https://cdn.sqhk.co/tevosenijosu/jihchfm/80376786620.pdf
    • https://cdn.sqhk.co/wezupobuwab/ajhijaf/41101375539.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f8c676c4-b411-4013-89e7-f43e948d016b/the_land_of_ice_and_fire_iceland.pdf
    • https://uploads.strikinglycdn.com/files/1c0c20e5-057c-4642-99e9-a410c0b2dfb2/what_is_16122_social_security_bonus.pdf
    • http://getetir.epizy.com/bsba_major_in_management_information_system.pdf
    • http://romufadi.epizy.com/12030001479.pdf
    • https://uploads.strikinglycdn.com/files/7d464030-a0b8-4354-869f-d3318ff7489b/ubiquiti_bullet_m2hp_firmware.pdf
    • http://kolenexe.epizy.com/how_to_get_better_conditioning_for_soccer.pdf
    • https://uploads.strikinglycdn.com/files/18974955-f4f9-4f94-9f42-33caf0dd7822/boy_scout_merit_badge_clinics_in_wi_2019.pdf
    • https://uploads.strikinglycdn.com/files/b023654f-f88e-4072-b87b-176a7beb714f/menexajo.pdf
    • http://zepukedosapiw.rf.gd/6_sigma_black_belt.pdf
    • http://mexefesu.epizy.com/adding_and_subtracting_decimals_worksheets_6th_grade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd1.bin
694435f5ec23c088ffecf72dd76ece4b9ec62d4dd397c439dd7297f598cbba44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 5580 bytes
font_01_sfnt_off0000ffb7.bin
1c4e6618e9865214a7e1e4435f278cdad89d7cbbcd43ea530780bbb8184644f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 10776 bytes

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